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3 Sheets-Sheet 2.

A. M. RICE.

Hot-Air Furnace.

Patented Oct. 26, 1852.

No.' 9,3518. A

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3 Sheets--Sheet 3. A. M. RICE.

Hot-Air Furnace.

Patented Oct. 26, 1852.

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UNITED STATES PATENT OFFICE.

AUGUSTUS M. RICE, OF BOSTON, MASSACHUSETTS, ASSIGNOR To HIMSELF AND S.H. LOMBARD.

HOT-AIR FURNACE.

Speccation of Letters Patent No. 9,358, dated October 26, 1852.

To all 'whom it may concern:

Be it known that I, AUGUSTUS M. RICE, of Boston, in the county of Suolkand State of Massachusetts, have invented an Improved Furnace forHeating Air for I/Varming Buildings; and I do hereby declare that thesame is fully desecribed and represented in the following specificationand the acvation of it.

companying drawings, letters, figures, and references thereof.

Of the said drawings Figure 1 denotes a top view of my said furnace,Fig. 2 is a front elevation of it. Fig. 3 is a side ele- Fig. I is acentral, vertical, and longitudinal section of it. Fig. 5 is ahorizontal section taken through the upper horizontal pipes of theradiator. Fig. 6 is a horizontal section taken through the lire placedoors. Fig. 7 is a horizontal section taken through the lower horizontalpipes of the radiator. Fig. 8 is a horizontal section taken through theash pit. Fig. 9 is a transverse, vertical, and central, section.

In the above figures -I have exhibited the metallic part of a furnacethat is usually set in brick work and within a hot air chamber orchamber into which cold air is introduced, heated by contact with theradiator, and finally discharged through pipes leading Out of the upperpart of the said chamber.

In the said drawings A represents the fire pot of the chamber ofcombustion B, the said fire pot being arranged within the chamber ofcombustion, and so that there shall be an air space C for air to passbetween the external surface of the fire pot and the concentric internalsurface of the chamber B. This space C is made to communicate with achamber D which surrounds or partially surrounds the ash pit E(furnished with a door E), and is entirely separated from it, so that noair from the ash pit can pass into it. The front of the chamber D isprovided with air inlet holes a, a, a, &c., to which one or more slidingvalves or'doors o, o, are applied in such manner as to enable a personto close such holes to such extent as may be necessary.

The grate is seen at F. The air which passes up through the grate forthe supply of the fire, rst passes into and through the ash pit when itsdoor G is opened, and such air is employed to kindle the fuel and makeit burn upward. When the fuel is sufiiciently on fire the ash pit doormay be closed and the holes a, a, &c., opened to such extent as may benecessary to allow sufficient air to pass into the chamber D, and fromthence up the space C and into the chamber of combustion, where minglingwith the volatile products of combustion it will enable the fire to burndownward. rIhe draft around the external sides of the fire pot will notonly aid in preventing it from being burned out, but will absorb andcarry off much of the powerful heat radiated directly from its sides,and which might otherwise tend to destroy the lower part of the casingcomposing the outer boundary of the chamber of combustion.

From the above it will be seen that I employ an air chamber D separatefrom the ash pit. I have heretofore made a stove wherein the air spacearound the fire pot was made to receive its air directly from the ashpit; but as by such means the regulation of the admission of air to t-hespace above the fuel as well as that of the air through the grateandfuel cannot be separately provided for, I have by employing the separatechamber D obtained a means of not only causing all the air for thesupply of combustion to be let into the chamber B, above the fire pot,but I can so let in only a part of it while the rest is made to pass upthrough the grate and fuel.

The grate F has a journal c extended from one side of it and in linewith a key shaft I-I, whose inner end is made polygonal in form andinserted in a socket piece d cast on the opposite side of the grate. Thegrate, its socket piece (into which the end of the key shaft H fits) andjournal c are so made and applied to the furnace that not only is thegrate supported by the journal and the key shaft, but when the latter iswithdrawn out of the socket the grate may fall down into the ash pit.The key shaft has a collar e fixed upon it, which by contact with aflanch Z of the ash pit door opening plate keeps the shaft from beingdrawn backward out of the socket piece. A notch f is made in the flanchCZ for the reception of the shaft and to form a bearing for it.

The brickwork of the furnace is to be so constructed that the shaft maybe lifted upward at any time out of the notch, so as to enable a personto withdraw it out of the socket of the grate, and then allow the grateto fall down. The shaft is supported near its inner end in a bearing ath. A crank i is fixed on the outer end of the shaft for the purpose ofenabling a person to rotate the grate at any time suiiiciently todischarge into the ash pit all or part of .the ashes or fuel in the firepot. By making the grate with a socket and one journal and supportingthe grate in part on the turning key shaft we have the advantage ofreadily removing a grate from the ire pot and supplying a new onewhenever it may be necessary so to do.

The chamber of combustion is surrounded on its `sides except where thefuel passage I enters it by a concentric chamber or flue space K, out ofwhose rear a pipe L is carried and made to open into the main dischargepipe M, in rear of a damper or flue valve N that is placed in the pipeM, the

isame being as seen in Fig. 4 of the drawings.

The pipe M opens out of the radiator and just above where thedischargepipe ofthe chamber of combustion is made to enter the same. The radiatoris composed of the chamber K, a horizontal pipe P, whose ends open outof the front of the said chamber at its lower part, the pipe beingcarried nearly around the chamber, a series of vertical pipes Q, Q, Q,opening out of the pipe P and extending upward and opening into ahorizontal flue R, made in the form as seen in Fig. 5. Each of thehorizontal flues P and R, is provided with two branch pipes T, T, thatare made t-o open out of the front of the same and to extend through thebrickwork, so as to enable a person to get access to the interior of theflues for the purpose of cleaning them when foul. The outer end of eachbranch pipe is provided with a cover U that may be removed at pleasure.When the damper N is closed the smoke and volatile products ofcombustion will pass into the upper part of the radiator and circulatethrough the flue R of the same, will pass down the vertical pipes Q, Q,&c., and into the flue P.

From there it will pass into the chamber or flue space K, and passthrough the same and in contact with the external sides of the chamberof combustion, and finally pass through the pipe L and into thedischarge pipe M. By opening the valve or damper N, the smoke willescape directly through the pipes O and M, without first coursingthrough the radiator. The draft through the radiator is greatlyfacilitated by having the smoke pass in contact with t-he hot externalsides 'of the chamber of combustion just before it escapes into thedischarge flue.

The radiator made in the manner as above described and set forth in thedrawings presents a very extended heating surface, and under suchcircumstances we obtain the requisite draftthrough it by the arrangementof lues as specified.

What I claim as my invention is as follows:

l. I claim the improved mode of making and supporting the grate, viz.,by the combination of a single journal, a socket piece,

and a crank key shaft, as applied to the furnace and grate and made tooperate substantially as specified. Y

2. I also claim' the peculiar combination and arrangement of thehorizontal flues P, R, the lvertical flues Q, Q, Q, and the flue space Ksurrounding the chamber of combustion, the whole being essentially asabove specified. j

In testimony whereof I have hereto set my signature this twenty-sixthday of March,

AUGUSTUS M. RICE. Witnesses:

R. I-I. EDDY, Y G. W. CUTLER.

